What controls variations in skin color among humans?

two alleles of a single gene

a person’s diet

multiple alleles of a single gene

many genes

depends on what parent genes are stronger

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

the closer the planet is to the sun, the larger the gravity